Fuel pump keeps running
Thread Starter
|
Senior User
Joined: Mar 2001
Posts: 471
Likes: 0
From: gulf coast
Fuel pump keeps running
Sometimes when I turn the engine off (302 cid) on my 91 Bronco, the in-tank electric fuel pump continues to run. Right now I have the battery disconnected in order to shut the pump off. Sounds like a stuck relay somewhere to me but I have not been able to locate one. Any help would be GREATLY appreciated!
New User
Joined: Mar 2007
Posts: 9
Likes: 0
Fast Freddie - so far I've come up with changing the relay, the fuel pressure regulator and the inertia switch. The relay makes the most sense - somehow it seems to be hanging open and draining the battery, I know I'm stating the obvious here, sorry. My relays on my '90 are under the hood on the driver's side in a plastic bracket right behind the washer fluid reservoir. I have no idea if your set up is the same but I know that in some later models, relays have sometimes been tucked in behind trim by the passenger's feet. I've changed the relay on my truck, and I'm going to leave the battery connected to see if I've solved my problem and will let you know what happens. Hope some of this has helped.
Dan
Dan
Trending Topics
New User
Joined: Mar 2007
Posts: 9
Likes: 0
Fast Freddie - by the way, I posted our question at 2carpros.com that has been very helpful. The thread in in Ford repairs under FUEL PUMP DRAINING BATTERY.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Thread Starter
|
Senior User
Joined: Mar 2001
Posts: 471
Likes: 0
From: gulf coast
Thanks...
Dan (and others), thanks for your responses. The only thing that makes sense to me is a relay sticking closed after the control power (from the ignition switch) is removed. When I was trying to trouble shoot it the other day I thought I heard a click over by the drivers side fender well at the same time that the pump stopped running but I couldn't find a relay anywhere in that area. Maybe someone will come along that knows if/where this relay resides.
Thanks again and please let me know if you learn anything new...
Thanks again and please let me know if you learn anything new...
New User
Joined: Mar 2007
Posts: 9
Likes: 0
There's a good chance that the relay is on the driver's side. I didn't know where it was either, so I pulled the negative terminal off the battery, then kept touching it to the negative post (to make it click) and felt around on the driver's side rocker panel until I found the relay. You can hear it and feel it.
HOWEVER - After pulling the relay, I could still feel a different "click" on the EFI rails - which makes me wonder if the relay is the problem and if I'm going to need a jump in the morning. Also, the relay clicks on, the fuel pump runs, then the relay clicks off, the fuel pump stops. I hope I'm wrong, but I think the problem rests elsewhere. Either way, I'm our Guinea Pig tonight. Anybody in the metro NY area that can give me a jump in the morning?
HOWEVER - After pulling the relay, I could still feel a different "click" on the EFI rails - which makes me wonder if the relay is the problem and if I'm going to need a jump in the morning. Also, the relay clicks on, the fuel pump runs, then the relay clicks off, the fuel pump stops. I hope I'm wrong, but I think the problem rests elsewhere. Either way, I'm our Guinea Pig tonight. Anybody in the metro NY area that can give me a jump in the morning?
Last edited by danfsmith; Mar 14, 2007 at 09:46 PM.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
if an injector is stuck open or the fuel pressure regulator is not functioning properly it will cause the pump to run. when you turn the key to the on position the pump should run for a few seconds to build pressure in the rail before the engine is started. if the pressure keeps bleeding off then the pump wouldnt know to shut off. if you pull the vacum line ontop of the fpr and gas is present the fpr would need replaced. Have you tried pulling codes as well. www.fordfuelinjection.com has instructions.
there are relays on the passenger side inner fender as well. either of you got a haynes manual
there are relays on the passenger side inner fender as well. either of you got a haynes manual
New User
Joined: Mar 2007
Posts: 9
Likes: 0
Dead battery this morning, so the relay was not the problem. Tonight, I'm going to unplug the alternator and see what I get tomorrow morning. If we're not buried in snow tomorrow morning, I'll also check the fpr like you advised, kemicalburns. Thank you for your help.
Senior User
Joined: Feb 2002
Posts: 224
Likes: 0
From: Mill Creek, WA
I believe if the FP Relay is not the problem it is likely the EEC Relay. Similar relay and probably in similar location on these trucks. This is from experience with Mustangs of similar years. Probably the other relay you heard clicking.
Adam
Adam
Senior User
Joined: Oct 2005
Posts: 125
Likes: 0
From: South Carolina
go to www.fordcds.com and download the file for you year. It has all the electrical schematics and component locations laid out. I've found it pretty helpful. Or you can go to www.helminc.com and buy the Electrical & Vacuum Troubleshooting Manual for your year.